1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/classLoader.hpp" 27 #include "classfile/classLoaderData.hpp" 28 #include "classfile/javaClasses.hpp" 29 #include "classfile/symbolTable.hpp" 30 #include "classfile/systemDictionary.hpp" 31 #include "classfile/vmSymbols.hpp" 32 #include "code/codeCache.hpp" 33 #include "code/dependencies.hpp" 34 #include "gc_interface/collectedHeap.inline.hpp" 35 #include "interpreter/interpreter.hpp" 36 #include "memory/cardTableModRefBS.hpp" 37 #include "memory/gcLocker.inline.hpp" 38 #include "memory/genCollectedHeap.hpp" 39 #include "memory/genRemSet.hpp" 40 #include "memory/generation.hpp" 41 #include "memory/metadataFactory.hpp" 42 #include "memory/metaspaceShared.hpp" 43 #include "memory/oopFactory.hpp" 44 #include "memory/space.hpp" 45 #include "memory/universe.hpp" 46 #include "memory/universe.inline.hpp" 47 #include "oops/constantPool.hpp" 48 #include "oops/instanceClassLoaderKlass.hpp" 49 #include "oops/instanceKlass.hpp" 50 #include "oops/instanceMirrorKlass.hpp" 51 #include "oops/instanceRefKlass.hpp" 52 #include "oops/oop.inline.hpp" 53 #include "oops/typeArrayKlass.hpp" 54 #include "prims/jvmtiRedefineClassesTrace.hpp" 55 #include "runtime/aprofiler.hpp" 56 #include "runtime/arguments.hpp" 57 #include "runtime/deoptimization.hpp" 58 #include "runtime/fprofiler.hpp" 59 #include "runtime/handles.inline.hpp" 60 #include "runtime/init.hpp" 61 #include "runtime/java.hpp" 62 #include "runtime/javaCalls.hpp" 63 #include "runtime/sharedRuntime.hpp" 64 #include "runtime/synchronizer.hpp" 65 #include "runtime/thread.inline.hpp" 66 #include "runtime/timer.hpp" 67 #include "runtime/vm_operations.hpp" 68 #include "services/memoryService.hpp" 69 #include "utilities/copy.hpp" 70 #include "utilities/events.hpp" 71 #include "utilities/hashtable.inline.hpp" 72 #include "utilities/preserveException.hpp" 73 #include "utilities/macros.hpp" 74 #if INCLUDE_ALL_GCS 75 #include "gc_implementation/concurrentMarkSweep/cmsAdaptiveSizePolicy.hpp" 76 #include "gc_implementation/concurrentMarkSweep/cmsCollectorPolicy.hpp" 77 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 78 #include "gc_implementation/g1/g1CollectorPolicy.hpp" 79 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 80 #endif // INCLUDE_ALL_GCS 81 82 // Known objects 83 Klass* Universe::_boolArrayKlassObj = NULL; 84 Klass* Universe::_byteArrayKlassObj = NULL; 85 Klass* Universe::_charArrayKlassObj = NULL; 86 Klass* Universe::_intArrayKlassObj = NULL; 87 Klass* Universe::_shortArrayKlassObj = NULL; 88 Klass* Universe::_longArrayKlassObj = NULL; 89 Klass* Universe::_singleArrayKlassObj = NULL; 90 Klass* Universe::_doubleArrayKlassObj = NULL; 91 Klass* Universe::_typeArrayKlassObjs[T_VOID+1] = { NULL /*, NULL...*/ }; 92 Klass* Universe::_objectArrayKlassObj = NULL; 93 oop Universe::_int_mirror = NULL; 94 oop Universe::_float_mirror = NULL; 95 oop Universe::_double_mirror = NULL; 96 oop Universe::_byte_mirror = NULL; 97 oop Universe::_bool_mirror = NULL; 98 oop Universe::_char_mirror = NULL; 99 oop Universe::_long_mirror = NULL; 100 oop Universe::_short_mirror = NULL; 101 oop Universe::_void_mirror = NULL; 102 oop Universe::_mirrors[T_VOID+1] = { NULL /*, NULL...*/ }; 103 oop Universe::_main_thread_group = NULL; 104 oop Universe::_system_thread_group = NULL; 105 objArrayOop Universe::_the_empty_class_klass_array = NULL; 106 Array<Klass*>* Universe::_the_array_interfaces_array = NULL; 107 oop Universe::_the_null_string = NULL; 108 oop Universe::_the_min_jint_string = NULL; 109 LatestMethodOopCache* Universe::_finalizer_register_cache = NULL; 110 LatestMethodOopCache* Universe::_loader_addClass_cache = NULL; 111 ActiveMethodOopsCache* Universe::_reflect_invoke_cache = NULL; 112 oop Universe::_out_of_memory_error_java_heap = NULL; 113 oop Universe::_out_of_memory_error_perm_gen = NULL; 114 oop Universe::_out_of_memory_error_array_size = NULL; 115 oop Universe::_out_of_memory_error_gc_overhead_limit = NULL; 116 objArrayOop Universe::_preallocated_out_of_memory_error_array = NULL; 117 volatile jint Universe::_preallocated_out_of_memory_error_avail_count = 0; 118 bool Universe::_verify_in_progress = false; 119 oop Universe::_null_ptr_exception_instance = NULL; 120 oop Universe::_arithmetic_exception_instance = NULL; 121 oop Universe::_virtual_machine_error_instance = NULL; 122 oop Universe::_vm_exception = NULL; 123 Array<int>* Universe::_the_empty_int_array = NULL; 124 Array<u2>* Universe::_the_empty_short_array = NULL; 125 Array<Klass*>* Universe::_the_empty_klass_array = NULL; 126 Array<Method*>* Universe::_the_empty_method_array = NULL; 127 128 // These variables are guarded by FullGCALot_lock. 129 debug_only(objArrayOop Universe::_fullgc_alot_dummy_array = NULL;) 130 debug_only(int Universe::_fullgc_alot_dummy_next = 0;) 131 132 // Heap 133 int Universe::_verify_count = 0; 134 135 int Universe::_base_vtable_size = 0; 136 bool Universe::_bootstrapping = false; 137 bool Universe::_fully_initialized = false; 138 139 size_t Universe::_heap_capacity_at_last_gc; 140 size_t Universe::_heap_used_at_last_gc = 0; 141 142 CollectedHeap* Universe::_collectedHeap = NULL; 143 144 NarrowPtrStruct Universe::_narrow_oop = { NULL, 0, true }; 145 NarrowPtrStruct Universe::_narrow_klass = { NULL, 0, true }; 146 address Universe::_narrow_ptrs_base; 147 148 size_t Universe::_class_metaspace_size; 149 150 void Universe::basic_type_classes_do(void f(Klass*)) { 151 f(boolArrayKlassObj()); 152 f(byteArrayKlassObj()); 153 f(charArrayKlassObj()); 154 f(intArrayKlassObj()); 155 f(shortArrayKlassObj()); 156 f(longArrayKlassObj()); 157 f(singleArrayKlassObj()); 158 f(doubleArrayKlassObj()); 159 } 160 161 void Universe::oops_do(OopClosure* f, bool do_all) { 162 163 f->do_oop((oop*) &_int_mirror); 164 f->do_oop((oop*) &_float_mirror); 165 f->do_oop((oop*) &_double_mirror); 166 f->do_oop((oop*) &_byte_mirror); 167 f->do_oop((oop*) &_bool_mirror); 168 f->do_oop((oop*) &_char_mirror); 169 f->do_oop((oop*) &_long_mirror); 170 f->do_oop((oop*) &_short_mirror); 171 f->do_oop((oop*) &_void_mirror); 172 173 for (int i = T_BOOLEAN; i < T_VOID+1; i++) { 174 f->do_oop((oop*) &_mirrors[i]); 175 } 176 assert(_mirrors[0] == NULL && _mirrors[T_BOOLEAN - 1] == NULL, "checking"); 177 178 f->do_oop((oop*)&_the_empty_class_klass_array); 179 f->do_oop((oop*)&_the_null_string); 180 f->do_oop((oop*)&_the_min_jint_string); 181 f->do_oop((oop*)&_out_of_memory_error_java_heap); 182 f->do_oop((oop*)&_out_of_memory_error_perm_gen); 183 f->do_oop((oop*)&_out_of_memory_error_array_size); 184 f->do_oop((oop*)&_out_of_memory_error_gc_overhead_limit); 185 f->do_oop((oop*)&_preallocated_out_of_memory_error_array); 186 f->do_oop((oop*)&_null_ptr_exception_instance); 187 f->do_oop((oop*)&_arithmetic_exception_instance); 188 f->do_oop((oop*)&_virtual_machine_error_instance); 189 f->do_oop((oop*)&_main_thread_group); 190 f->do_oop((oop*)&_system_thread_group); 191 f->do_oop((oop*)&_vm_exception); 192 debug_only(f->do_oop((oop*)&_fullgc_alot_dummy_array);) 193 } 194 195 // Serialize metadata in and out of CDS archive, not oops. 196 void Universe::serialize(SerializeClosure* f, bool do_all) { 197 198 f->do_ptr((void**)&_boolArrayKlassObj); 199 f->do_ptr((void**)&_byteArrayKlassObj); 200 f->do_ptr((void**)&_charArrayKlassObj); 201 f->do_ptr((void**)&_intArrayKlassObj); 202 f->do_ptr((void**)&_shortArrayKlassObj); 203 f->do_ptr((void**)&_longArrayKlassObj); 204 f->do_ptr((void**)&_singleArrayKlassObj); 205 f->do_ptr((void**)&_doubleArrayKlassObj); 206 f->do_ptr((void**)&_objectArrayKlassObj); 207 208 { 209 for (int i = 0; i < T_VOID+1; i++) { 210 if (_typeArrayKlassObjs[i] != NULL) { 211 assert(i >= T_BOOLEAN, "checking"); 212 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 213 } else if (do_all) { 214 f->do_ptr((void**)&_typeArrayKlassObjs[i]); 215 } 216 } 217 } 218 219 f->do_ptr((void**)&_the_array_interfaces_array); 220 f->do_ptr((void**)&_the_empty_int_array); 221 f->do_ptr((void**)&_the_empty_short_array); 222 f->do_ptr((void**)&_the_empty_method_array); 223 f->do_ptr((void**)&_the_empty_klass_array); 224 _finalizer_register_cache->serialize(f); 225 _loader_addClass_cache->serialize(f); 226 _reflect_invoke_cache->serialize(f); 227 } 228 229 void Universe::check_alignment(uintx size, uintx alignment, const char* name) { 230 if (size < alignment || size % alignment != 0) { 231 ResourceMark rm; 232 stringStream st; 233 st.print("Size of %s (" UINTX_FORMAT " bytes) must be aligned to " UINTX_FORMAT " bytes", name, size, alignment); 234 char* error = st.as_string(); 235 vm_exit_during_initialization(error); 236 } 237 } 238 239 void initialize_basic_type_klass(Klass* k, TRAPS) { 240 Klass* ok = SystemDictionary::Object_klass(); 241 if (UseSharedSpaces) { 242 assert(k->super() == ok, "u3"); 243 k->restore_unshareable_info(CHECK); 244 } else { 245 k->initialize_supers(ok, CHECK); 246 } 247 k->append_to_sibling_list(); 248 } 249 250 void Universe::genesis(TRAPS) { 251 ResourceMark rm; 252 253 { FlagSetting fs(_bootstrapping, true); 254 255 { MutexLocker mc(Compile_lock); 256 257 // determine base vtable size; without that we cannot create the array klasses 258 compute_base_vtable_size(); 259 260 if (!UseSharedSpaces) { 261 _boolArrayKlassObj = TypeArrayKlass::create_klass(T_BOOLEAN, sizeof(jboolean), CHECK); 262 _charArrayKlassObj = TypeArrayKlass::create_klass(T_CHAR, sizeof(jchar), CHECK); 263 _singleArrayKlassObj = TypeArrayKlass::create_klass(T_FLOAT, sizeof(jfloat), CHECK); 264 _doubleArrayKlassObj = TypeArrayKlass::create_klass(T_DOUBLE, sizeof(jdouble), CHECK); 265 _byteArrayKlassObj = TypeArrayKlass::create_klass(T_BYTE, sizeof(jbyte), CHECK); 266 _shortArrayKlassObj = TypeArrayKlass::create_klass(T_SHORT, sizeof(jshort), CHECK); 267 _intArrayKlassObj = TypeArrayKlass::create_klass(T_INT, sizeof(jint), CHECK); 268 _longArrayKlassObj = TypeArrayKlass::create_klass(T_LONG, sizeof(jlong), CHECK); 269 270 _typeArrayKlassObjs[T_BOOLEAN] = _boolArrayKlassObj; 271 _typeArrayKlassObjs[T_CHAR] = _charArrayKlassObj; 272 _typeArrayKlassObjs[T_FLOAT] = _singleArrayKlassObj; 273 _typeArrayKlassObjs[T_DOUBLE] = _doubleArrayKlassObj; 274 _typeArrayKlassObjs[T_BYTE] = _byteArrayKlassObj; 275 _typeArrayKlassObjs[T_SHORT] = _shortArrayKlassObj; 276 _typeArrayKlassObjs[T_INT] = _intArrayKlassObj; 277 _typeArrayKlassObjs[T_LONG] = _longArrayKlassObj; 278 279 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 280 281 _the_array_interfaces_array = MetadataFactory::new_array<Klass*>(null_cld, 2, NULL, CHECK); 282 _the_empty_int_array = MetadataFactory::new_array<int>(null_cld, 0, CHECK); 283 _the_empty_short_array = MetadataFactory::new_array<u2>(null_cld, 0, CHECK); 284 _the_empty_method_array = MetadataFactory::new_array<Method*>(null_cld, 0, CHECK); 285 _the_empty_klass_array = MetadataFactory::new_array<Klass*>(null_cld, 0, CHECK); 286 } 287 } 288 289 vmSymbols::initialize(CHECK); 290 291 SystemDictionary::initialize(CHECK); 292 293 Klass* ok = SystemDictionary::Object_klass(); 294 295 _the_null_string = StringTable::intern("null", CHECK); 296 _the_min_jint_string = StringTable::intern("-2147483648", CHECK); 297 298 if (UseSharedSpaces) { 299 // Verify shared interfaces array. 300 assert(_the_array_interfaces_array->at(0) == 301 SystemDictionary::Cloneable_klass(), "u3"); 302 assert(_the_array_interfaces_array->at(1) == 303 SystemDictionary::Serializable_klass(), "u3"); 304 } else { 305 // Set up shared interfaces array. (Do this before supers are set up.) 306 _the_array_interfaces_array->at_put(0, SystemDictionary::Cloneable_klass()); 307 _the_array_interfaces_array->at_put(1, SystemDictionary::Serializable_klass()); 308 } 309 310 initialize_basic_type_klass(boolArrayKlassObj(), CHECK); 311 initialize_basic_type_klass(charArrayKlassObj(), CHECK); 312 initialize_basic_type_klass(singleArrayKlassObj(), CHECK); 313 initialize_basic_type_klass(doubleArrayKlassObj(), CHECK); 314 initialize_basic_type_klass(byteArrayKlassObj(), CHECK); 315 initialize_basic_type_klass(shortArrayKlassObj(), CHECK); 316 initialize_basic_type_klass(intArrayKlassObj(), CHECK); 317 initialize_basic_type_klass(longArrayKlassObj(), CHECK); 318 } // end of core bootstrapping 319 320 // Maybe this could be lifted up now that object array can be initialized 321 // during the bootstrapping. 322 323 // OLD 324 // Initialize _objectArrayKlass after core bootstraping to make 325 // sure the super class is set up properly for _objectArrayKlass. 326 // --- 327 // NEW 328 // Since some of the old system object arrays have been converted to 329 // ordinary object arrays, _objectArrayKlass will be loaded when 330 // SystemDictionary::initialize(CHECK); is run. See the extra check 331 // for Object_klass_loaded in objArrayKlassKlass::allocate_objArray_klass_impl. 332 _objectArrayKlassObj = InstanceKlass:: 333 cast(SystemDictionary::Object_klass())->array_klass(1, CHECK); 334 // OLD 335 // Add the class to the class hierarchy manually to make sure that 336 // its vtable is initialized after core bootstrapping is completed. 337 // --- 338 // New 339 // Have already been initialized. 340 _objectArrayKlassObj->append_to_sibling_list(); 341 342 // Compute is_jdk version flags. 343 // Only 1.3 or later has the java.lang.Shutdown class. 344 // Only 1.4 or later has the java.lang.CharSequence interface. 345 // Only 1.5 or later has the java.lang.management.MemoryUsage class. 346 if (JDK_Version::is_partially_initialized()) { 347 uint8_t jdk_version; 348 Klass* k = SystemDictionary::resolve_or_null( 349 vmSymbols::java_lang_management_MemoryUsage(), THREAD); 350 CLEAR_PENDING_EXCEPTION; // ignore exceptions 351 if (k == NULL) { 352 k = SystemDictionary::resolve_or_null( 353 vmSymbols::java_lang_CharSequence(), THREAD); 354 CLEAR_PENDING_EXCEPTION; // ignore exceptions 355 if (k == NULL) { 356 k = SystemDictionary::resolve_or_null( 357 vmSymbols::java_lang_Shutdown(), THREAD); 358 CLEAR_PENDING_EXCEPTION; // ignore exceptions 359 if (k == NULL) { 360 jdk_version = 2; 361 } else { 362 jdk_version = 3; 363 } 364 } else { 365 jdk_version = 4; 366 } 367 } else { 368 jdk_version = 5; 369 } 370 JDK_Version::fully_initialize(jdk_version); 371 } 372 373 #ifdef ASSERT 374 if (FullGCALot) { 375 // Allocate an array of dummy objects. 376 // We'd like these to be at the bottom of the old generation, 377 // so that when we free one and then collect, 378 // (almost) the whole heap moves 379 // and we find out if we actually update all the oops correctly. 380 // But we can't allocate directly in the old generation, 381 // so we allocate wherever, and hope that the first collection 382 // moves these objects to the bottom of the old generation. 383 // We can allocate directly in the permanent generation, so we do. 384 int size; 385 if (UseConcMarkSweepGC) { 386 warning("Using +FullGCALot with concurrent mark sweep gc " 387 "will not force all objects to relocate"); 388 size = FullGCALotDummies; 389 } else { 390 size = FullGCALotDummies * 2; 391 } 392 objArrayOop naked_array = oopFactory::new_objArray(SystemDictionary::Object_klass(), size, CHECK); 393 objArrayHandle dummy_array(THREAD, naked_array); 394 int i = 0; 395 while (i < size) { 396 // Allocate dummy in old generation 397 oop dummy = InstanceKlass::cast(SystemDictionary::Object_klass())->allocate_instance(CHECK); 398 dummy_array->obj_at_put(i++, dummy); 399 } 400 { 401 // Only modify the global variable inside the mutex. 402 // If we had a race to here, the other dummy_array instances 403 // and their elements just get dropped on the floor, which is fine. 404 MutexLocker ml(FullGCALot_lock); 405 if (_fullgc_alot_dummy_array == NULL) { 406 _fullgc_alot_dummy_array = dummy_array(); 407 } 408 } 409 assert(i == _fullgc_alot_dummy_array->length(), "just checking"); 410 } 411 #endif 412 413 // Initialize dependency array for null class loader 414 ClassLoaderData::the_null_class_loader_data()->init_dependencies(CHECK); 415 416 } 417 418 // CDS support for patching vtables in metadata in the shared archive. 419 // All types inherited from Metadata have vtables, but not types inherited 420 // from MetaspaceObj, because the latter does not have virtual functions. 421 // If the metadata type has a vtable, it cannot be shared in the read-only 422 // section of the CDS archive, because the vtable pointer is patched. 423 static inline void add_vtable(void** list, int* n, void* o, int count) { 424 guarantee((*n) < count, "vtable list too small"); 425 void* vtable = dereference_vptr(o); 426 assert(*(void**)(vtable) != NULL, "invalid vtable"); 427 list[(*n)++] = vtable; 428 } 429 430 void Universe::init_self_patching_vtbl_list(void** list, int count) { 431 int n = 0; 432 { InstanceKlass o; add_vtable(list, &n, &o, count); } 433 { InstanceClassLoaderKlass o; add_vtable(list, &n, &o, count); } 434 { InstanceMirrorKlass o; add_vtable(list, &n, &o, count); } 435 { InstanceRefKlass o; add_vtable(list, &n, &o, count); } 436 { TypeArrayKlass o; add_vtable(list, &n, &o, count); } 437 { ObjArrayKlass o; add_vtable(list, &n, &o, count); } 438 { Method o; add_vtable(list, &n, &o, count); } 439 { ConstantPool o; add_vtable(list, &n, &o, count); } 440 } 441 442 void Universe::initialize_basic_type_mirrors(TRAPS) { 443 assert(_int_mirror==NULL, "basic type mirrors already initialized"); 444 _int_mirror = 445 java_lang_Class::create_basic_type_mirror("int", T_INT, CHECK); 446 _float_mirror = 447 java_lang_Class::create_basic_type_mirror("float", T_FLOAT, CHECK); 448 _double_mirror = 449 java_lang_Class::create_basic_type_mirror("double", T_DOUBLE, CHECK); 450 _byte_mirror = 451 java_lang_Class::create_basic_type_mirror("byte", T_BYTE, CHECK); 452 _bool_mirror = 453 java_lang_Class::create_basic_type_mirror("boolean",T_BOOLEAN, CHECK); 454 _char_mirror = 455 java_lang_Class::create_basic_type_mirror("char", T_CHAR, CHECK); 456 _long_mirror = 457 java_lang_Class::create_basic_type_mirror("long", T_LONG, CHECK); 458 _short_mirror = 459 java_lang_Class::create_basic_type_mirror("short", T_SHORT, CHECK); 460 _void_mirror = 461 java_lang_Class::create_basic_type_mirror("void", T_VOID, CHECK); 462 463 _mirrors[T_INT] = _int_mirror; 464 _mirrors[T_FLOAT] = _float_mirror; 465 _mirrors[T_DOUBLE] = _double_mirror; 466 _mirrors[T_BYTE] = _byte_mirror; 467 _mirrors[T_BOOLEAN] = _bool_mirror; 468 _mirrors[T_CHAR] = _char_mirror; 469 _mirrors[T_LONG] = _long_mirror; 470 _mirrors[T_SHORT] = _short_mirror; 471 _mirrors[T_VOID] = _void_mirror; 472 //_mirrors[T_OBJECT] = InstanceKlass::cast(_object_klass)->java_mirror(); 473 //_mirrors[T_ARRAY] = InstanceKlass::cast(_object_klass)->java_mirror(); 474 } 475 476 void Universe::fixup_mirrors(TRAPS) { 477 // Bootstrap problem: all classes gets a mirror (java.lang.Class instance) assigned eagerly, 478 // but we cannot do that for classes created before java.lang.Class is loaded. Here we simply 479 // walk over permanent objects created so far (mostly classes) and fixup their mirrors. Note 480 // that the number of objects allocated at this point is very small. 481 assert(SystemDictionary::Class_klass_loaded(), "java.lang.Class should be loaded"); 482 HandleMark hm(THREAD); 483 // Cache the start of the static fields 484 InstanceMirrorKlass::init_offset_of_static_fields(); 485 486 GrowableArray <Klass*>* list = java_lang_Class::fixup_mirror_list(); 487 int list_length = list->length(); 488 for (int i = 0; i < list_length; i++) { 489 Klass* k = list->at(i); 490 assert(k->is_klass(), "List should only hold classes"); 491 EXCEPTION_MARK; 492 KlassHandle kh(THREAD, k); 493 java_lang_Class::fixup_mirror(kh, CATCH); 494 } 495 delete java_lang_Class::fixup_mirror_list(); 496 java_lang_Class::set_fixup_mirror_list(NULL); 497 } 498 499 static bool has_run_finalizers_on_exit = false; 500 501 void Universe::run_finalizers_on_exit() { 502 if (has_run_finalizers_on_exit) return; 503 has_run_finalizers_on_exit = true; 504 505 // Called on VM exit. This ought to be run in a separate thread. 506 if (TraceReferenceGC) tty->print_cr("Callback to run finalizers on exit"); 507 { 508 PRESERVE_EXCEPTION_MARK; 509 KlassHandle finalizer_klass(THREAD, SystemDictionary::Finalizer_klass()); 510 JavaValue result(T_VOID); 511 JavaCalls::call_static( 512 &result, 513 finalizer_klass, 514 vmSymbols::run_finalizers_on_exit_name(), 515 vmSymbols::void_method_signature(), 516 THREAD 517 ); 518 // Ignore any pending exceptions 519 CLEAR_PENDING_EXCEPTION; 520 } 521 } 522 523 524 // initialize_vtable could cause gc if 525 // 1) we specified true to initialize_vtable and 526 // 2) this ran after gc was enabled 527 // In case those ever change we use handles for oops 528 void Universe::reinitialize_vtable_of(KlassHandle k_h, TRAPS) { 529 // init vtable of k and all subclasses 530 Klass* ko = k_h(); 531 klassVtable* vt = ko->vtable(); 532 if (vt) vt->initialize_vtable(false, CHECK); 533 if (ko->oop_is_instance()) { 534 InstanceKlass* ik = (InstanceKlass*)ko; 535 for (KlassHandle s_h(THREAD, ik->subklass()); s_h() != NULL; s_h = (THREAD, s_h()->next_sibling())) { 536 reinitialize_vtable_of(s_h, CHECK); 537 } 538 } 539 } 540 541 542 void initialize_itable_for_klass(Klass* k, TRAPS) { 543 InstanceKlass::cast(k)->itable()->initialize_itable(false, CHECK); 544 } 545 546 547 void Universe::reinitialize_itables(TRAPS) { 548 SystemDictionary::classes_do(initialize_itable_for_klass, CHECK); 549 550 } 551 552 553 bool Universe::on_page_boundary(void* addr) { 554 return ((uintptr_t) addr) % os::vm_page_size() == 0; 555 } 556 557 558 bool Universe::should_fill_in_stack_trace(Handle throwable) { 559 // never attempt to fill in the stack trace of preallocated errors that do not have 560 // backtrace. These errors are kept alive forever and may be "re-used" when all 561 // preallocated errors with backtrace have been consumed. Also need to avoid 562 // a potential loop which could happen if an out of memory occurs when attempting 563 // to allocate the backtrace. 564 return ((throwable() != Universe::_out_of_memory_error_java_heap) && 565 (throwable() != Universe::_out_of_memory_error_perm_gen) && 566 (throwable() != Universe::_out_of_memory_error_array_size) && 567 (throwable() != Universe::_out_of_memory_error_gc_overhead_limit)); 568 } 569 570 571 oop Universe::gen_out_of_memory_error(oop default_err) { 572 // generate an out of memory error: 573 // - if there is a preallocated error with backtrace available then return it wth 574 // a filled in stack trace. 575 // - if there are no preallocated errors with backtrace available then return 576 // an error without backtrace. 577 int next; 578 if (_preallocated_out_of_memory_error_avail_count > 0) { 579 next = (int)Atomic::add(-1, &_preallocated_out_of_memory_error_avail_count); 580 assert(next < (int)PreallocatedOutOfMemoryErrorCount, "avail count is corrupt"); 581 } else { 582 next = -1; 583 } 584 if (next < 0) { 585 // all preallocated errors have been used. 586 // return default 587 return default_err; 588 } else { 589 // get the error object at the slot and set set it to NULL so that the 590 // array isn't keeping it alive anymore. 591 oop exc = preallocated_out_of_memory_errors()->obj_at(next); 592 assert(exc != NULL, "slot has been used already"); 593 preallocated_out_of_memory_errors()->obj_at_put(next, NULL); 594 595 // use the message from the default error 596 oop msg = java_lang_Throwable::message(default_err); 597 assert(msg != NULL, "no message"); 598 java_lang_Throwable::set_message(exc, msg); 599 600 // populate the stack trace and return it. 601 java_lang_Throwable::fill_in_stack_trace_of_preallocated_backtrace(exc); 602 return exc; 603 } 604 } 605 606 static intptr_t non_oop_bits = 0; 607 608 void* Universe::non_oop_word() { 609 // Neither the high bits nor the low bits of this value is allowed 610 // to look like (respectively) the high or low bits of a real oop. 611 // 612 // High and low are CPU-specific notions, but low always includes 613 // the low-order bit. Since oops are always aligned at least mod 4, 614 // setting the low-order bit will ensure that the low half of the 615 // word will never look like that of a real oop. 616 // 617 // Using the OS-supplied non-memory-address word (usually 0 or -1) 618 // will take care of the high bits, however many there are. 619 620 if (non_oop_bits == 0) { 621 non_oop_bits = (intptr_t)os::non_memory_address_word() | 1; 622 } 623 624 return (void*)non_oop_bits; 625 } 626 627 jint universe_init() { 628 assert(!Universe::_fully_initialized, "called after initialize_vtables"); 629 guarantee(1 << LogHeapWordSize == sizeof(HeapWord), 630 "LogHeapWordSize is incorrect."); 631 guarantee(sizeof(oop) >= sizeof(HeapWord), "HeapWord larger than oop?"); 632 guarantee(sizeof(oop) % sizeof(HeapWord) == 0, 633 "oop size is not not a multiple of HeapWord size"); 634 TraceTime timer("Genesis", TraceStartupTime); 635 GC_locker::lock(); // do not allow gc during bootstrapping 636 JavaClasses::compute_hard_coded_offsets(); 637 638 jint status = Universe::initialize_heap(); 639 if (status != JNI_OK) { 640 return status; 641 } 642 643 // Create memory for metadata. Must be after initializing heap for 644 // DumpSharedSpaces. 645 ClassLoaderData::init_null_class_loader_data(); 646 647 // We have a heap so create the Method* caches before 648 // Metaspace::initialize_shared_spaces() tries to populate them. 649 Universe::_finalizer_register_cache = new LatestMethodOopCache(); 650 Universe::_loader_addClass_cache = new LatestMethodOopCache(); 651 Universe::_reflect_invoke_cache = new ActiveMethodOopsCache(); 652 653 if (UseSharedSpaces) { 654 // Read the data structures supporting the shared spaces (shared 655 // system dictionary, symbol table, etc.). After that, access to 656 // the file (other than the mapped regions) is no longer needed, and 657 // the file is closed. Closing the file does not affect the 658 // currently mapped regions. 659 MetaspaceShared::initialize_shared_spaces(); 660 StringTable::create_table(); 661 } else { 662 SymbolTable::create_table(); 663 StringTable::create_table(); 664 ClassLoader::create_package_info_table(); 665 } 666 667 return JNI_OK; 668 } 669 670 // Choose the heap base address and oop encoding mode 671 // when compressed oops are used: 672 // Unscaled - Use 32-bits oops without encoding when 673 // NarrowOopHeapBaseMin + heap_size < 4Gb 674 // ZeroBased - Use zero based compressed oops with encoding when 675 // NarrowOopHeapBaseMin + heap_size < 32Gb 676 // HeapBased - Use compressed oops with heap base + encoding. 677 678 // 4Gb 679 static const uint64_t NarrowOopHeapMax = (uint64_t(max_juint) + 1); 680 // 32Gb 681 // OopEncodingHeapMax == NarrowOopHeapMax << LogMinObjAlignmentInBytes; 682 683 char* Universe::preferred_heap_base(size_t heap_size, NARROW_OOP_MODE mode) { 684 size_t base = 0; 685 #ifdef _LP64 686 if (UseCompressedOops) { 687 assert(mode == UnscaledNarrowOop || 688 mode == ZeroBasedNarrowOop || 689 mode == HeapBasedNarrowOop, "mode is invalid"); 690 const size_t total_size = heap_size + HeapBaseMinAddress; 691 // Return specified base for the first request. 692 if (!FLAG_IS_DEFAULT(HeapBaseMinAddress) && (mode == UnscaledNarrowOop)) { 693 base = HeapBaseMinAddress; 694 695 // If the total size and the metaspace size are small enough to allow 696 // UnscaledNarrowOop then just use UnscaledNarrowOop. 697 } else if ((total_size <= OopEncodingHeapMax) && (mode != HeapBasedNarrowOop) && 698 (!UseCompressedKlassPointers || 699 (((OopEncodingHeapMax - heap_size) + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax))) { 700 // We don't need to check the metaspace size here because it is always smaller 701 // than total_size. 702 if ((total_size <= NarrowOopHeapMax) && (mode == UnscaledNarrowOop) && 703 (Universe::narrow_oop_shift() == 0)) { 704 // Use 32-bits oops without encoding and 705 // place heap's top on the 4Gb boundary 706 base = (NarrowOopHeapMax - heap_size); 707 } else { 708 // Can't reserve with NarrowOopShift == 0 709 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 710 if (mode == UnscaledNarrowOop || 711 mode == ZeroBasedNarrowOop && total_size <= NarrowOopHeapMax) { 712 // Use zero based compressed oops with encoding and 713 // place heap's top on the 32Gb boundary in case 714 // total_size > 4Gb or failed to reserve below 4Gb. 715 base = (OopEncodingHeapMax - heap_size); 716 } 717 } 718 719 // See if ZeroBaseNarrowOop encoding will work for a heap based at 720 // (KlassEncodingMetaspaceMax - class_metaspace_size()). 721 } else if (UseCompressedKlassPointers && (mode != HeapBasedNarrowOop) && 722 (Universe::class_metaspace_size() + HeapBaseMinAddress <= KlassEncodingMetaspaceMax) && 723 (KlassEncodingMetaspaceMax + heap_size - Universe::class_metaspace_size() <= OopEncodingHeapMax)) { 724 base = (KlassEncodingMetaspaceMax - Universe::class_metaspace_size()); 725 } else { 726 // UnscaledNarrowOop encoding didn't work, and no base was found for ZeroBasedOops or 727 // HeapBasedNarrowOop encoding was requested. So, can't reserve below 32Gb. 728 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 729 } 730 731 // Set narrow_oop_base and narrow_oop_use_implicit_null_checks 732 // used in ReservedHeapSpace() constructors. 733 // The final values will be set in initialize_heap() below. 734 if ((base != 0) && ((base + heap_size) <= OopEncodingHeapMax) && 735 (!UseCompressedKlassPointers || (base + Universe::class_metaspace_size()) <= KlassEncodingMetaspaceMax)) { 736 // Use zero based compressed oops 737 Universe::set_narrow_oop_base(NULL); 738 // Don't need guard page for implicit checks in indexed 739 // addressing mode with zero based Compressed Oops. 740 Universe::set_narrow_oop_use_implicit_null_checks(true); 741 } else { 742 // Set to a non-NULL value so the ReservedSpace ctor computes 743 // the correct no-access prefix. 744 // The final value will be set in initialize_heap() below. 745 Universe::set_narrow_oop_base((address)NarrowOopHeapMax); 746 #ifdef _WIN64 747 if (UseLargePages) { 748 // Cannot allocate guard pages for implicit checks in indexed 749 // addressing mode when large pages are specified on windows. 750 Universe::set_narrow_oop_use_implicit_null_checks(false); 751 } 752 #endif // _WIN64 753 } 754 } 755 #endif 756 return (char*)base; // also return NULL (don't care) for 32-bit VM 757 } 758 759 jint Universe::initialize_heap() { 760 761 if (UseParallelGC) { 762 #if INCLUDE_ALL_GCS 763 Universe::_collectedHeap = new ParallelScavengeHeap(); 764 #else // INCLUDE_ALL_GCS 765 fatal("UseParallelGC not supported in this VM."); 766 #endif // INCLUDE_ALL_GCS 767 768 } else if (UseG1GC) { 769 #if INCLUDE_ALL_GCS 770 G1CollectorPolicy* g1p = new G1CollectorPolicy(); 771 G1CollectedHeap* g1h = new G1CollectedHeap(g1p); 772 Universe::_collectedHeap = g1h; 773 #else // INCLUDE_ALL_GCS 774 fatal("UseG1GC not supported in java kernel vm."); 775 #endif // INCLUDE_ALL_GCS 776 777 } else { 778 GenCollectorPolicy *gc_policy; 779 780 if (UseSerialGC) { 781 gc_policy = new MarkSweepPolicy(); 782 } else if (UseConcMarkSweepGC) { 783 #if INCLUDE_ALL_GCS 784 if (UseAdaptiveSizePolicy) { 785 gc_policy = new ASConcurrentMarkSweepPolicy(); 786 } else { 787 gc_policy = new ConcurrentMarkSweepPolicy(); 788 } 789 #else // INCLUDE_ALL_GCS 790 fatal("UseConcMarkSweepGC not supported in this VM."); 791 #endif // INCLUDE_ALL_GCS 792 } else { // default old generation 793 gc_policy = new MarkSweepPolicy(); 794 } 795 796 Universe::_collectedHeap = new GenCollectedHeap(gc_policy); 797 } 798 799 jint status = Universe::heap()->initialize(); 800 if (status != JNI_OK) { 801 return status; 802 } 803 804 #ifdef _LP64 805 if (UseCompressedOops) { 806 // Subtract a page because something can get allocated at heap base. 807 // This also makes implicit null checking work, because the 808 // memory+1 page below heap_base needs to cause a signal. 809 // See needs_explicit_null_check. 810 // Only set the heap base for compressed oops because it indicates 811 // compressed oops for pstack code. 812 bool verbose = PrintCompressedOopsMode || (PrintMiscellaneous && Verbose); 813 if (verbose) { 814 tty->cr(); 815 tty->print("heap address: " PTR_FORMAT ", size: " SIZE_FORMAT " MB", 816 Universe::heap()->base(), Universe::heap()->reserved_region().byte_size()/M); 817 } 818 if (((uint64_t)Universe::heap()->reserved_region().end() > OopEncodingHeapMax) || 819 (UseCompressedKlassPointers && 820 ((uint64_t)Universe::heap()->base() + Universe::class_metaspace_size() > KlassEncodingMetaspaceMax))) { 821 // Can't reserve heap below 32Gb. 822 // keep the Universe::narrow_oop_base() set in Universe::reserve_heap() 823 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 824 if (verbose) { 825 tty->print(", Compressed Oops with base: "PTR_FORMAT, Universe::narrow_oop_base()); 826 } 827 } else { 828 Universe::set_narrow_oop_base(0); 829 if (verbose) { 830 tty->print(", zero based Compressed Oops"); 831 } 832 #ifdef _WIN64 833 if (!Universe::narrow_oop_use_implicit_null_checks()) { 834 // Don't need guard page for implicit checks in indexed addressing 835 // mode with zero based Compressed Oops. 836 Universe::set_narrow_oop_use_implicit_null_checks(true); 837 } 838 #endif // _WIN64 839 if((uint64_t)Universe::heap()->reserved_region().end() > NarrowOopHeapMax) { 840 // Can't reserve heap below 4Gb. 841 Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes); 842 } else { 843 Universe::set_narrow_oop_shift(0); 844 if (verbose) { 845 tty->print(", 32-bits Oops"); 846 } 847 } 848 } 849 if (verbose) { 850 tty->cr(); 851 tty->cr(); 852 } 853 if (UseCompressedKlassPointers) { 854 Universe::set_narrow_klass_base(Universe::narrow_oop_base()); 855 Universe::set_narrow_klass_shift(MIN2(Universe::narrow_oop_shift(), LogKlassAlignmentInBytes)); 856 } 857 Universe::set_narrow_ptrs_base(Universe::narrow_oop_base()); 858 } 859 // Universe::narrow_oop_base() is one page below the metaspace 860 // base. The actual metaspace base depends on alignment constraints 861 // so we don't know its exact location here. 862 assert((intptr_t)Universe::narrow_oop_base() <= (intptr_t)(Universe::heap()->base() - os::vm_page_size() - ClassMetaspaceSize) || 863 Universe::narrow_oop_base() == NULL, "invalid value"); 864 assert(Universe::narrow_oop_shift() == LogMinObjAlignmentInBytes || 865 Universe::narrow_oop_shift() == 0, "invalid value"); 866 #endif 867 868 // We will never reach the CATCH below since Exceptions::_throw will cause 869 // the VM to exit if an exception is thrown during initialization 870 871 if (UseTLAB) { 872 assert(Universe::heap()->supports_tlab_allocation(), 873 "Should support thread-local allocation buffers"); 874 ThreadLocalAllocBuffer::startup_initialization(); 875 } 876 return JNI_OK; 877 } 878 879 880 // Reserve the Java heap, which is now the same for all GCs. 881 ReservedSpace Universe::reserve_heap(size_t heap_size, size_t alignment) { 882 // Add in the class metaspace area so the classes in the headers can 883 // be compressed the same as instances. 884 // Need to round class space size up because it's below the heap and 885 // the actual alignment depends on its size. 886 Universe::set_class_metaspace_size(align_size_up(ClassMetaspaceSize, alignment)); 887 size_t total_reserved = align_size_up(heap_size + Universe::class_metaspace_size(), alignment); 888 char* addr = Universe::preferred_heap_base(total_reserved, Universe::UnscaledNarrowOop); 889 890 ReservedHeapSpace total_rs(total_reserved, alignment, UseLargePages, addr); 891 892 if (UseCompressedOops) { 893 if (addr != NULL && !total_rs.is_reserved()) { 894 // Failed to reserve at specified address - the requested memory 895 // region is taken already, for example, by 'java' launcher. 896 // Try again to reserver heap higher. 897 addr = Universe::preferred_heap_base(total_reserved, Universe::ZeroBasedNarrowOop); 898 899 ReservedHeapSpace total_rs0(total_reserved, alignment, 900 UseLargePages, addr); 901 902 if (addr != NULL && !total_rs0.is_reserved()) { 903 // Failed to reserve at specified address again - give up. 904 addr = Universe::preferred_heap_base(total_reserved, Universe::HeapBasedNarrowOop); 905 assert(addr == NULL, ""); 906 907 ReservedHeapSpace total_rs1(total_reserved, alignment, 908 UseLargePages, addr); 909 total_rs = total_rs1; 910 } else { 911 total_rs = total_rs0; 912 } 913 } 914 } 915 916 if (!total_rs.is_reserved()) { 917 vm_exit_during_initialization(err_msg("Could not reserve enough space for object heap %d bytes", total_reserved)); 918 return total_rs; 919 } 920 921 // Split the reserved space into main Java heap and a space for 922 // classes so that they can be compressed using the same algorithm 923 // as compressed oops. If compress oops and compress klass ptrs are 924 // used we need the meta space first: if the alignment used for 925 // compressed oops is greater than the one used for compressed klass 926 // ptrs, a metadata space on top of the heap could become 927 // unreachable. 928 ReservedSpace class_rs = total_rs.first_part(Universe::class_metaspace_size()); 929 ReservedSpace heap_rs = total_rs.last_part(Universe::class_metaspace_size(), alignment); 930 Metaspace::initialize_class_space(class_rs); 931 932 if (UseCompressedOops) { 933 // Universe::initialize_heap() will reset this to NULL if unscaled 934 // or zero-based narrow oops are actually used. 935 address base = (address)(total_rs.base() - os::vm_page_size()); 936 Universe::set_narrow_oop_base(base); 937 } 938 return heap_rs; 939 } 940 941 942 // It's the caller's repsonsibility to ensure glitch-freedom 943 // (if required). 944 void Universe::update_heap_info_at_gc() { 945 _heap_capacity_at_last_gc = heap()->capacity(); 946 _heap_used_at_last_gc = heap()->used(); 947 } 948 949 950 951 void universe2_init() { 952 EXCEPTION_MARK; 953 Universe::genesis(CATCH); 954 // Although we'd like to verify here that the state of the heap 955 // is good, we can't because the main thread has not yet added 956 // itself to the threads list (so, using current interfaces 957 // we can't "fill" its TLAB), unless TLABs are disabled. 958 if (VerifyBeforeGC && !UseTLAB && 959 Universe::heap()->total_collections() >= VerifyGCStartAt) { 960 Universe::heap()->prepare_for_verify(); 961 Universe::verify(); // make sure we're starting with a clean slate 962 } 963 } 964 965 966 // This function is defined in JVM.cpp 967 extern void initialize_converter_functions(); 968 969 bool universe_post_init() { 970 assert(!is_init_completed(), "Error: initialization not yet completed!"); 971 Universe::_fully_initialized = true; 972 EXCEPTION_MARK; 973 { ResourceMark rm; 974 Interpreter::initialize(); // needed for interpreter entry points 975 if (!UseSharedSpaces) { 976 HandleMark hm(THREAD); 977 KlassHandle ok_h(THREAD, SystemDictionary::Object_klass()); 978 Universe::reinitialize_vtable_of(ok_h, CHECK_false); 979 Universe::reinitialize_itables(CHECK_false); 980 } 981 } 982 983 HandleMark hm(THREAD); 984 Klass* k; 985 instanceKlassHandle k_h; 986 // Setup preallocated empty java.lang.Class array 987 Universe::_the_empty_class_klass_array = oopFactory::new_objArray(SystemDictionary::Class_klass(), 0, CHECK_false); 988 989 // Setup preallocated OutOfMemoryError errors 990 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_OutOfMemoryError(), true, CHECK_false); 991 k_h = instanceKlassHandle(THREAD, k); 992 Universe::_out_of_memory_error_java_heap = k_h->allocate_instance(CHECK_false); 993 Universe::_out_of_memory_error_perm_gen = k_h->allocate_instance(CHECK_false); 994 Universe::_out_of_memory_error_array_size = k_h->allocate_instance(CHECK_false); 995 Universe::_out_of_memory_error_gc_overhead_limit = 996 k_h->allocate_instance(CHECK_false); 997 998 // Setup preallocated NullPointerException 999 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1000 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_NullPointerException(), true, CHECK_false); 1001 Universe::_null_ptr_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1002 // Setup preallocated ArithmeticException 1003 // (this is currently used for a cheap & dirty solution in compiler exception handling) 1004 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ArithmeticException(), true, CHECK_false); 1005 Universe::_arithmetic_exception_instance = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1006 // Virtual Machine Error for when we get into a situation we can't resolve 1007 k = SystemDictionary::resolve_or_fail( 1008 vmSymbols::java_lang_VirtualMachineError(), true, CHECK_false); 1009 bool linked = InstanceKlass::cast(k)->link_class_or_fail(CHECK_false); 1010 if (!linked) { 1011 tty->print_cr("Unable to link/verify VirtualMachineError class"); 1012 return false; // initialization failed 1013 } 1014 Universe::_virtual_machine_error_instance = 1015 InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1016 1017 Universe::_vm_exception = InstanceKlass::cast(k)->allocate_instance(CHECK_false); 1018 1019 if (!DumpSharedSpaces) { 1020 // These are the only Java fields that are currently set during shared space dumping. 1021 // We prefer to not handle this generally, so we always reinitialize these detail messages. 1022 Handle msg = java_lang_String::create_from_str("Java heap space", CHECK_false); 1023 java_lang_Throwable::set_message(Universe::_out_of_memory_error_java_heap, msg()); 1024 1025 msg = java_lang_String::create_from_str("Metadata space", CHECK_false); 1026 java_lang_Throwable::set_message(Universe::_out_of_memory_error_perm_gen, msg()); 1027 1028 msg = java_lang_String::create_from_str("Requested array size exceeds VM limit", CHECK_false); 1029 java_lang_Throwable::set_message(Universe::_out_of_memory_error_array_size, msg()); 1030 1031 msg = java_lang_String::create_from_str("GC overhead limit exceeded", CHECK_false); 1032 java_lang_Throwable::set_message(Universe::_out_of_memory_error_gc_overhead_limit, msg()); 1033 1034 msg = java_lang_String::create_from_str("/ by zero", CHECK_false); 1035 java_lang_Throwable::set_message(Universe::_arithmetic_exception_instance, msg()); 1036 1037 // Setup the array of errors that have preallocated backtrace 1038 k = Universe::_out_of_memory_error_java_heap->klass(); 1039 assert(k->name() == vmSymbols::java_lang_OutOfMemoryError(), "should be out of memory error"); 1040 k_h = instanceKlassHandle(THREAD, k); 1041 1042 int len = (StackTraceInThrowable) ? (int)PreallocatedOutOfMemoryErrorCount : 0; 1043 Universe::_preallocated_out_of_memory_error_array = oopFactory::new_objArray(k_h(), len, CHECK_false); 1044 for (int i=0; i<len; i++) { 1045 oop err = k_h->allocate_instance(CHECK_false); 1046 Handle err_h = Handle(THREAD, err); 1047 java_lang_Throwable::allocate_backtrace(err_h, CHECK_false); 1048 Universe::preallocated_out_of_memory_errors()->obj_at_put(i, err_h()); 1049 } 1050 Universe::_preallocated_out_of_memory_error_avail_count = (jint)len; 1051 } 1052 1053 1054 // Setup static method for registering finalizers 1055 // The finalizer klass must be linked before looking up the method, in 1056 // case it needs to get rewritten. 1057 InstanceKlass::cast(SystemDictionary::Finalizer_klass())->link_class(CHECK_false); 1058 Method* m = InstanceKlass::cast(SystemDictionary::Finalizer_klass())->find_method( 1059 vmSymbols::register_method_name(), 1060 vmSymbols::register_method_signature()); 1061 if (m == NULL || !m->is_static()) { 1062 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1063 "java.lang.ref.Finalizer.register", false); 1064 } 1065 Universe::_finalizer_register_cache->init( 1066 SystemDictionary::Finalizer_klass(), m, CHECK_false); 1067 1068 // Resolve on first use and initialize class. 1069 // Note: No race-condition here, since a resolve will always return the same result 1070 1071 // Setup method for security checks 1072 k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_reflect_Method(), true, CHECK_false); 1073 k_h = instanceKlassHandle(THREAD, k); 1074 k_h->link_class(CHECK_false); 1075 m = k_h->find_method(vmSymbols::invoke_name(), vmSymbols::object_object_array_object_signature()); 1076 if (m == NULL || m->is_static()) { 1077 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1078 "java.lang.reflect.Method.invoke", false); 1079 } 1080 Universe::_reflect_invoke_cache->init(k_h(), m, CHECK_false); 1081 1082 // Setup method for registering loaded classes in class loader vector 1083 InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->link_class(CHECK_false); 1084 m = InstanceKlass::cast(SystemDictionary::ClassLoader_klass())->find_method(vmSymbols::addClass_name(), vmSymbols::class_void_signature()); 1085 if (m == NULL || m->is_static()) { 1086 THROW_MSG_(vmSymbols::java_lang_NoSuchMethodException(), 1087 "java.lang.ClassLoader.addClass", false); 1088 } 1089 Universe::_loader_addClass_cache->init( 1090 SystemDictionary::ClassLoader_klass(), m, CHECK_false); 1091 1092 // The folowing is initializing converter functions for serialization in 1093 // JVM.cpp. If we clean up the StrictMath code above we may want to find 1094 // a better solution for this as well. 1095 initialize_converter_functions(); 1096 1097 // This needs to be done before the first scavenge/gc, since 1098 // it's an input to soft ref clearing policy. 1099 { 1100 MutexLocker x(Heap_lock); 1101 Universe::update_heap_info_at_gc(); 1102 } 1103 1104 // ("weak") refs processing infrastructure initialization 1105 Universe::heap()->post_initialize(); 1106 1107 // Initialize performance counters for metaspaces 1108 MetaspaceCounters::initialize_performance_counters(); 1109 1110 GC_locker::unlock(); // allow gc after bootstrapping 1111 1112 MemoryService::set_universe_heap(Universe::_collectedHeap); 1113 return true; 1114 } 1115 1116 1117 void Universe::compute_base_vtable_size() { 1118 _base_vtable_size = ClassLoader::compute_Object_vtable(); 1119 } 1120 1121 1122 // %%% The Universe::flush_foo methods belong in CodeCache. 1123 1124 // Flushes compiled methods dependent on dependee. 1125 void Universe::flush_dependents_on(instanceKlassHandle dependee) { 1126 assert_lock_strong(Compile_lock); 1127 1128 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1129 1130 // CodeCache can only be updated by a thread_in_VM and they will all be 1131 // stopped dring the safepoint so CodeCache will be safe to update without 1132 // holding the CodeCache_lock. 1133 1134 KlassDepChange changes(dependee); 1135 1136 // Compute the dependent nmethods 1137 if (CodeCache::mark_for_deoptimization(changes) > 0) { 1138 // At least one nmethod has been marked for deoptimization 1139 VM_Deoptimize op; 1140 VMThread::execute(&op); 1141 } 1142 } 1143 1144 // Flushes compiled methods dependent on a particular CallSite 1145 // instance when its target is different than the given MethodHandle. 1146 void Universe::flush_dependents_on(Handle call_site, Handle method_handle) { 1147 assert_lock_strong(Compile_lock); 1148 1149 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1150 1151 // CodeCache can only be updated by a thread_in_VM and they will all be 1152 // stopped dring the safepoint so CodeCache will be safe to update without 1153 // holding the CodeCache_lock. 1154 1155 CallSiteDepChange changes(call_site(), method_handle()); 1156 1157 // Compute the dependent nmethods that have a reference to a 1158 // CallSite object. We use InstanceKlass::mark_dependent_nmethod 1159 // directly instead of CodeCache::mark_for_deoptimization because we 1160 // want dependents on the call site class only not all classes in 1161 // the ContextStream. 1162 int marked = 0; 1163 { 1164 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1165 InstanceKlass* call_site_klass = InstanceKlass::cast(call_site->klass()); 1166 marked = call_site_klass->mark_dependent_nmethods(changes); 1167 } 1168 if (marked > 0) { 1169 // At least one nmethod has been marked for deoptimization 1170 VM_Deoptimize op; 1171 VMThread::execute(&op); 1172 } 1173 } 1174 1175 #ifdef HOTSWAP 1176 // Flushes compiled methods dependent on dependee in the evolutionary sense 1177 void Universe::flush_evol_dependents_on(instanceKlassHandle ev_k_h) { 1178 // --- Compile_lock is not held. However we are at a safepoint. 1179 assert_locked_or_safepoint(Compile_lock); 1180 if (CodeCache::number_of_nmethods_with_dependencies() == 0) return; 1181 1182 // CodeCache can only be updated by a thread_in_VM and they will all be 1183 // stopped dring the safepoint so CodeCache will be safe to update without 1184 // holding the CodeCache_lock. 1185 1186 // Compute the dependent nmethods 1187 if (CodeCache::mark_for_evol_deoptimization(ev_k_h) > 0) { 1188 // At least one nmethod has been marked for deoptimization 1189 1190 // All this already happens inside a VM_Operation, so we'll do all the work here. 1191 // Stuff copied from VM_Deoptimize and modified slightly. 1192 1193 // We do not want any GCs to happen while we are in the middle of this VM operation 1194 ResourceMark rm; 1195 DeoptimizationMarker dm; 1196 1197 // Deoptimize all activations depending on marked nmethods 1198 Deoptimization::deoptimize_dependents(); 1199 1200 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1201 CodeCache::make_marked_nmethods_not_entrant(); 1202 } 1203 } 1204 #endif // HOTSWAP 1205 1206 1207 // Flushes compiled methods dependent on dependee 1208 void Universe::flush_dependents_on_method(methodHandle m_h) { 1209 // --- Compile_lock is not held. However we are at a safepoint. 1210 assert_locked_or_safepoint(Compile_lock); 1211 1212 // CodeCache can only be updated by a thread_in_VM and they will all be 1213 // stopped dring the safepoint so CodeCache will be safe to update without 1214 // holding the CodeCache_lock. 1215 1216 // Compute the dependent nmethods 1217 if (CodeCache::mark_for_deoptimization(m_h()) > 0) { 1218 // At least one nmethod has been marked for deoptimization 1219 1220 // All this already happens inside a VM_Operation, so we'll do all the work here. 1221 // Stuff copied from VM_Deoptimize and modified slightly. 1222 1223 // We do not want any GCs to happen while we are in the middle of this VM operation 1224 ResourceMark rm; 1225 DeoptimizationMarker dm; 1226 1227 // Deoptimize all activations depending on marked nmethods 1228 Deoptimization::deoptimize_dependents(); 1229 1230 // Make the dependent methods not entrant (in VM_Deoptimize they are made zombies) 1231 CodeCache::make_marked_nmethods_not_entrant(); 1232 } 1233 } 1234 1235 void Universe::print() { 1236 print_on(gclog_or_tty); 1237 } 1238 1239 void Universe::print_on(outputStream* st, bool extended) { 1240 st->print_cr("Heap"); 1241 if (!extended) { 1242 heap()->print_on(st); 1243 } else { 1244 heap()->print_extended_on(st); 1245 } 1246 } 1247 1248 void Universe::print_heap_at_SIGBREAK() { 1249 if (PrintHeapAtSIGBREAK) { 1250 MutexLocker hl(Heap_lock); 1251 print_on(tty); 1252 tty->cr(); 1253 tty->flush(); 1254 } 1255 } 1256 1257 void Universe::print_heap_before_gc(outputStream* st, bool ignore_extended) { 1258 st->print_cr("{Heap before GC invocations=%u (full %u):", 1259 heap()->total_collections(), 1260 heap()->total_full_collections()); 1261 if (!PrintHeapAtGCExtended || ignore_extended) { 1262 heap()->print_on(st); 1263 } else { 1264 heap()->print_extended_on(st); 1265 } 1266 } 1267 1268 void Universe::print_heap_after_gc(outputStream* st, bool ignore_extended) { 1269 st->print_cr("Heap after GC invocations=%u (full %u):", 1270 heap()->total_collections(), 1271 heap()->total_full_collections()); 1272 if (!PrintHeapAtGCExtended || ignore_extended) { 1273 heap()->print_on(st); 1274 } else { 1275 heap()->print_extended_on(st); 1276 } 1277 st->print_cr("}"); 1278 } 1279 1280 void Universe::verify(bool silent, VerifyOption option) { 1281 // The use of _verify_in_progress is a temporary work around for 1282 // 6320749. Don't bother with a creating a class to set and clear 1283 // it since it is only used in this method and the control flow is 1284 // straight forward. 1285 _verify_in_progress = true; 1286 1287 COMPILER2_PRESENT( 1288 assert(!DerivedPointerTable::is_active(), 1289 "DPT should not be active during verification " 1290 "(of thread stacks below)"); 1291 ) 1292 1293 ResourceMark rm; 1294 HandleMark hm; // Handles created during verification can be zapped 1295 _verify_count++; 1296 1297 if (!silent) gclog_or_tty->print("[Verifying "); 1298 if (!silent) gclog_or_tty->print("threads "); 1299 Threads::verify(); 1300 heap()->verify(silent, option); 1301 1302 if (!silent) gclog_or_tty->print("syms "); 1303 SymbolTable::verify(); 1304 if (!silent) gclog_or_tty->print("strs "); 1305 StringTable::verify(); 1306 { 1307 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1308 if (!silent) gclog_or_tty->print("zone "); 1309 CodeCache::verify(); 1310 } 1311 if (!silent) gclog_or_tty->print("dict "); 1312 SystemDictionary::verify(); 1313 #ifndef PRODUCT 1314 if (!silent) gclog_or_tty->print("cldg "); 1315 ClassLoaderDataGraph::verify(); 1316 #endif 1317 if (!silent) gclog_or_tty->print("metaspace chunks "); 1318 MetaspaceAux::verify_free_chunks(); 1319 if (!silent) gclog_or_tty->print("hand "); 1320 JNIHandles::verify(); 1321 if (!silent) gclog_or_tty->print("C-heap "); 1322 os::check_heap(); 1323 if (!silent) gclog_or_tty->print("code cache "); 1324 CodeCache::verify_oops(); 1325 if (!silent) gclog_or_tty->print_cr("]"); 1326 1327 _verify_in_progress = false; 1328 } 1329 1330 // Oop verification (see MacroAssembler::verify_oop) 1331 1332 static uintptr_t _verify_oop_data[2] = {0, (uintptr_t)-1}; 1333 static uintptr_t _verify_klass_data[2] = {0, (uintptr_t)-1}; 1334 1335 1336 static void calculate_verify_data(uintptr_t verify_data[2], 1337 HeapWord* low_boundary, 1338 HeapWord* high_boundary) { 1339 assert(low_boundary < high_boundary, "bad interval"); 1340 1341 // decide which low-order bits we require to be clear: 1342 size_t alignSize = MinObjAlignmentInBytes; 1343 size_t min_object_size = CollectedHeap::min_fill_size(); 1344 1345 // make an inclusive limit: 1346 uintptr_t max = (uintptr_t)high_boundary - min_object_size*wordSize; 1347 uintptr_t min = (uintptr_t)low_boundary; 1348 assert(min < max, "bad interval"); 1349 uintptr_t diff = max ^ min; 1350 1351 // throw away enough low-order bits to make the diff vanish 1352 uintptr_t mask = (uintptr_t)(-1); 1353 while ((mask & diff) != 0) 1354 mask <<= 1; 1355 uintptr_t bits = (min & mask); 1356 assert(bits == (max & mask), "correct mask"); 1357 // check an intermediate value between min and max, just to make sure: 1358 assert(bits == ((min + (max-min)/2) & mask), "correct mask"); 1359 1360 // require address alignment, too: 1361 mask |= (alignSize - 1); 1362 1363 if (!(verify_data[0] == 0 && verify_data[1] == (uintptr_t)-1)) { 1364 assert(verify_data[0] == mask && verify_data[1] == bits, "mask stability"); 1365 } 1366 verify_data[0] = mask; 1367 verify_data[1] = bits; 1368 } 1369 1370 1371 // Oop verification (see MacroAssembler::verify_oop) 1372 #ifndef PRODUCT 1373 1374 uintptr_t Universe::verify_oop_mask() { 1375 MemRegion m = heap()->reserved_region(); 1376 calculate_verify_data(_verify_oop_data, 1377 m.start(), 1378 m.end()); 1379 return _verify_oop_data[0]; 1380 } 1381 1382 1383 1384 uintptr_t Universe::verify_oop_bits() { 1385 verify_oop_mask(); 1386 return _verify_oop_data[1]; 1387 } 1388 1389 uintptr_t Universe::verify_mark_mask() { 1390 return markOopDesc::lock_mask_in_place; 1391 } 1392 1393 uintptr_t Universe::verify_mark_bits() { 1394 intptr_t mask = verify_mark_mask(); 1395 intptr_t bits = (intptr_t)markOopDesc::prototype(); 1396 assert((bits & ~mask) == 0, "no stray header bits"); 1397 return bits; 1398 } 1399 #endif // PRODUCT 1400 1401 1402 void Universe::compute_verify_oop_data() { 1403 verify_oop_mask(); 1404 verify_oop_bits(); 1405 verify_mark_mask(); 1406 verify_mark_bits(); 1407 } 1408 1409 1410 void CommonMethodOopCache::init(Klass* k, Method* m, TRAPS) { 1411 if (!UseSharedSpaces) { 1412 _klass = k; 1413 } 1414 #ifndef PRODUCT 1415 else { 1416 // sharing initilization should have already set up _klass 1417 assert(_klass != NULL, "just checking"); 1418 } 1419 #endif 1420 1421 _method_idnum = m->method_idnum(); 1422 assert(_method_idnum >= 0, "sanity check"); 1423 } 1424 1425 1426 ActiveMethodOopsCache::~ActiveMethodOopsCache() { 1427 if (_prev_methods != NULL) { 1428 delete _prev_methods; 1429 _prev_methods = NULL; 1430 } 1431 } 1432 1433 1434 void ActiveMethodOopsCache::add_previous_version(Method* const method) { 1435 assert(Thread::current()->is_VM_thread(), 1436 "only VMThread can add previous versions"); 1437 1438 // Only append the previous method if it is executing on the stack. 1439 if (method->on_stack()) { 1440 1441 if (_prev_methods == NULL) { 1442 // This is the first previous version so make some space. 1443 // Start with 2 elements under the assumption that the class 1444 // won't be redefined much. 1445 _prev_methods = new (ResourceObj::C_HEAP, mtClass) GrowableArray<Method*>(2, true); 1446 } 1447 1448 // RC_TRACE macro has an embedded ResourceMark 1449 RC_TRACE(0x00000100, 1450 ("add: %s(%s): adding prev version ref for cached method @%d", 1451 method->name()->as_C_string(), method->signature()->as_C_string(), 1452 _prev_methods->length())); 1453 1454 _prev_methods->append(method); 1455 } 1456 1457 1458 // Since the caller is the VMThread and we are at a safepoint, this is a good 1459 // time to clear out unused method references. 1460 1461 if (_prev_methods == NULL) return; 1462 1463 for (int i = _prev_methods->length() - 1; i >= 0; i--) { 1464 Method* method = _prev_methods->at(i); 1465 assert(method != NULL, "weak method ref was unexpectedly cleared"); 1466 1467 if (!method->on_stack()) { 1468 // This method isn't running anymore so remove it 1469 _prev_methods->remove_at(i); 1470 MetadataFactory::free_metadata(method->method_holder()->class_loader_data(), method); 1471 } else { 1472 // RC_TRACE macro has an embedded ResourceMark 1473 RC_TRACE(0x00000400, ("add: %s(%s): previous cached method @%d is alive", 1474 method->name()->as_C_string(), method->signature()->as_C_string(), i)); 1475 } 1476 } 1477 } // end add_previous_version() 1478 1479 1480 bool ActiveMethodOopsCache::is_same_method(Method* const method) const { 1481 InstanceKlass* ik = InstanceKlass::cast(klass()); 1482 Method* check_method = ik->method_with_idnum(method_idnum()); 1483 assert(check_method != NULL, "sanity check"); 1484 if (check_method == method) { 1485 // done with the easy case 1486 return true; 1487 } 1488 1489 if (_prev_methods != NULL) { 1490 // The cached method has been redefined at least once so search 1491 // the previous versions for a match. 1492 for (int i = 0; i < _prev_methods->length(); i++) { 1493 check_method = _prev_methods->at(i); 1494 if (check_method == method) { 1495 // a previous version matches 1496 return true; 1497 } 1498 } 1499 } 1500 1501 // either no previous versions or no previous version matched 1502 return false; 1503 } 1504 1505 1506 Method* LatestMethodOopCache::get_Method() { 1507 InstanceKlass* ik = InstanceKlass::cast(klass()); 1508 Method* m = ik->method_with_idnum(method_idnum()); 1509 assert(m != NULL, "sanity check"); 1510 return m; 1511 } 1512 1513 1514 #ifdef ASSERT 1515 // Release dummy object(s) at bottom of heap 1516 bool Universe::release_fullgc_alot_dummy() { 1517 MutexLocker ml(FullGCALot_lock); 1518 if (_fullgc_alot_dummy_array != NULL) { 1519 if (_fullgc_alot_dummy_next >= _fullgc_alot_dummy_array->length()) { 1520 // No more dummies to release, release entire array instead 1521 _fullgc_alot_dummy_array = NULL; 1522 return false; 1523 } 1524 if (!UseConcMarkSweepGC) { 1525 // Release dummy at bottom of old generation 1526 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1527 } 1528 // Release dummy at bottom of permanent generation 1529 _fullgc_alot_dummy_array->obj_at_put(_fullgc_alot_dummy_next++, NULL); 1530 } 1531 return true; 1532 } 1533 1534 #endif // ASSERT